APE1701 Datasheet, PDF (1/9 Pages) Advanced Power Electronics Corp. – 150KHz, 2A PWM BUCK DC/DC CONVERTER

Advanced Power
Electronics Corp.
APE1701
150KHz, 2A PWM BUCK DC/DC CONVERTER
FEATURES
Output Voltage : 3.3V, 5V, 12V and Adjustable
Output Voltage
Adjustable Version Output Voltage Range, 1.23V
to 19.5V
150KHz Fixed Switching Frequency.
Voltage Mode Non-synchronous PWM Control.
Thermal-shutdown and Current-limit Protection.
ON/OFF Shutdown Control Input.
Short Circuit Protect(SCP)
Operating Voltage can be up to 22V
Output Load Current 2A
SO-8 Package
Low Power Standby Mode.
Built-in Switching Transistor on Chip
RoHS Compliant
DESCRIPTION
The APE1701 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of driving a
2A load without additional transistor. It saves board space.
The external shutdown function can be controlled by logic
level and then come into standby mode. The internal
compensation makes feedback control having good line and
load regulation without external design. Regarding protected
function, thermal shutdown is to prevent over temperature
operating from damage, and current limit is against over
current operating of the output switch. If current limit
function occurs and VFB is down below 0.5V, the switching
frequency will be reduced. The APE1701 series operates at
a switching frequency of 150KHz thus allow smaller sized
filter components than what would be needed with lower
frequency switching regulators. The output version included
fixed 3.3V, 5V, 12V, and an adjustable type. The chips are
available in a standard SO-8 package.
TYPICAL APPLICATION
1. ADJUSTABLE OUTPUT VOLTAGE VERSION
VIN=12V
C1
470uF
C2
0.1uF
U1
Vcc Vss
SW Vss
FB Vss
EN Vss
ON/OFF
APE1701
L1
1
2
33uH
D1
B340A
Vout=5.0V/2A
R1
4.7K
C3
470uF
C6
0.1uF
R2
1.5K
V_OUT = V_FB (1 + R1/R2 )
V_FB = 1.23V
R2 = 0.47K ~ 2.6K
Table 1 Resistor select for output voltage setting
V_OUT
R2
R1
1.5K
4.7K
5V
1.8K
5.6K
3.3V
1.5K
1.8K
2.5K
3.0K
2.5V
1.8K
1.8K
1.8V
1.8K
0.82K
Data and specifications subject to change without notice
1
201207176